<!DOCTYPE html><html lang="zh-CN" data-theme="light"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1"><title>SpringCloud之Ribbon负载均衡服务调用 | Kylin</title><meta name="keywords" content="SpringCloud,Ribbon"><meta name="author" content="Kylin"><meta name="copyright" content="Kylin"><meta name="format-detection" content="telephone=no"><meta name="theme-color" content="#ffffff"><meta name="description" content="简介官网https:&#x2F;&#x2F;github.com&#x2F;Netflix&#x2F;ribbon&#x2F;wiki&#x2F;Getting-Started Spring Cloud Ribbon是基于Netfix Ribbon实现的一套客户端负载均衡的工具 简单的说，Ribbon是Netfix发布的开源项目，主要功能是提供客户端的软件负载均衡算法和服务调用。Ribbon客户端组件提供一系列完善的配置项如连接超时，重试等。简单的说，就">
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</head><body><div id="web_bg"></div><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="author-avatar"><img class="avatar-img" data-lazy-src="https://qiniu.codekylin.cn/img/20200807181526.jpg" onerror="onerror=null;src='https://qiniu.codekylin.cn/github/img/friend_404.gif'" alt="avatar"/></div><div class="site-data"><div class="data-item is-center"><div class="data-item-link"><a href="/archives/"><div class="headline">文章</div><div class="length-num">362</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/tags/"><div class="headline">标签</div><div class="length-num">427</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/categories/"><div class="headline">分类</div><div class="length-num">101</div></a></div></div></div><hr/><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fa fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fa fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fa fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fa fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fa fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fa fa-heart"></i><span> 关于</span></a></div></div></div></div><div class="post" id="body-wrap"><header class="post-bg" id="page-header" style="background-image: url('https://qiniu.codekylin.cn/github/img/img/wallhaven-48wo32.jpg')"><nav id="nav"><span id="blog_name"><a id="site-name" href="/">Kylin</a></span><div id="menus"><div id="search-button"><a class="site-page social-icon search"><i class="fas fa-search fa-fw"></i><span> 搜索</span></a></div><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fa fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fa fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fa fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fa fa-folder-open"></i><span> 分类</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fa fa-link"></i><span> 友链</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fa fa-heart"></i><span> 关于</span></a></div></div><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">SpringCloud之Ribbon负载均衡服务调用</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-07-07T02:47:50.000Z" title="发表于 2020-07-07 10:47:50">2020-07-07</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-07-12T11:42:49.991Z" title="更新于 2022-07-12 19:42:49">2022-07-12</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/SpringCloud/">SpringCloud</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/SpringCloud/%E6%9C%8D%E5%8A%A1%E8%B0%83%E7%94%A8/">服务调用</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">1.7k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>6分钟</span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200704103128.png" alt="Cloud技术栈"></p>
<h2 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h2><p>官网<a target="_blank" rel="noopener" href="https://github.com/Netflix/ribbon/wiki/Getting-Started">https://github.com/Netflix/ribbon/wiki/Getting-Started</a></p>
<p>Spring Cloud Ribbon是基于Netfix Ribbon实现的一套<mark><strong>客户端负载均衡</strong></mark>的工具</p>
<p>简单的说，Ribbon是Netfix发布的开源项目，主要功能是提供<mark><strong>客户端的软件负载均衡算法和服务调用</strong></mark>。Ribbon客户端组件提供一系列完善的配置项如连接超时，重试等。简单的说，就是在配置文件中列处Load Balancer（简称LB）后面所有的机器，Ribbon会自动的帮你基于某种规则（如简单轮询，随机连接等）去连接这些机器。我们很容易使用Ribbon实现自定义的负载均衡算法。</p>
<p>Ribbon目前也进入维护模式</p>
<p>未来想使用Spring Cloud Loadbalancer替换Ribbon</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707105901.png" alt="image-20200707105900655"></p>
<h2 id="负载均衡"><a href="#负载均衡" class="headerlink" title="负载均衡"></a>负载均衡</h2><p>LB负载均衡（Load Balance）是什么？</p>
<p><strong>简单来说就是将用户的请求平摊的分配到多个服务上，从而达到系统的高可用（HA）。常见的负载均衡有软件Nginx,LVS,硬件F5等。</strong></p>
<p>Ribbon本地负载均衡客户端 VS Nginx服务端负载均衡的区别</p>
<p><strong>Nginx是服务器负载均衡，客户端所有请求都会交给Nginx，然后由Nginx实现转发请求。即负载均衡是由服务端实现的。</strong></p>
<p><strong>Ribbon本地负载均衡，在调用微服务接口的时候，会在注册中心上获取注册信息服务列表之后缓存到JVM本地，从而在本地实现RPC远程服务调用技术。</strong></p>
<p><strong>Nginx 适合于服务器端实现负载均衡 比如 Tomcat ，Ribbon 适合与在微服务中 RPC 远程调用实现本地服务负载均衡，比如 Dubbo、SpringCloud 中都是采用本地负载均衡</strong></p>
<h3 id="集中式LB"><a href="#集中式LB" class="headerlink" title="集中式LB"></a>集中式LB</h3><p>即在服务的消费方和提供方之间使用独立的LB设施（可以是硬件，如F5，也可以是软件，如Nginx）由该设施负载把访问请求通过某种策略转发至服务的提供方。</p>
<h3 id="进程内LB"><a href="#进程内LB" class="headerlink" title="进程内LB"></a>进程内LB</h3><p>将LB逻辑集成到消费方，消费方从服务注册中心获知有哪些地址可用,然后自己再从这些地址中选择出一个合适的服务器。</p>
<p>Ribbon就属于进程内LB，它只是一个类库，集成于消费方进程，消费方通过它来获取服务提供方的地址。</p>
<p>前面我们讲解过了80通过轮询负载访问8001/8002</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707111158.png" alt="image-20200707111157126"></p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200706181440.gif" alt="GIF"></p>
<p><mark><strong>Eureka默认集成了Ribbon，这个例子就是使用了Ribbon负载均衡+RestTemplate服务调用,Ribbon就是负载均衡+RestTemplate</strong></mark></p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707111743.png" alt="image-20200707111741323"></p>
<h2 id="架构说明"><a href="#架构说明" class="headerlink" title="架构说明"></a>架构说明</h2><p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707112039.png" alt="image-20200707112034262"></p>
<p>Ribbon在工作时分成两步</p>
<p>第一步先选择Eureka Server，它优先选择在同一个区域内负载较少的server。</p>
<p>第二步再根据用户指定的策略，在从server取到的服务注册列表中选择一个地址。其中Ribbon提供了多种策略：比如轮询，随机和根据响应时间加权。默认使用轮询</p>
<p><mark><strong>Ribbon其实就是一个软负载均衡的客户端组件，他可以和其他所需请求的客户端结合使用，和eureka结合只是其中的一个实例。</strong></mark></p>
<h2 id="RestTemplate使用"><a href="#RestTemplate使用" class="headerlink" title="RestTemplate使用"></a>RestTemplate使用</h2><p>官网<a target="_blank" rel="noopener" href="https://docs.spring.io/spring-framework/docs/5.2.2.RELEASE/javadoc-api/org/springframework/web/client/RestTemplate.html">https://docs.spring.io/spring-framework/docs/5.2.2.RELEASE/javadoc-api/org/springframework/web/client/RestTemplate.html</a></p>
<h3 id="getForEntity"><a href="#getForEntity" class="headerlink" title="getForEntity"></a>getForEntity</h3><p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707113406.png" alt="image-20200707113403946"></p>
<p>修改80的controller</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707113445.png" alt="image-20200707113443043"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//包含更详细的请求头，请求体之类的信息 getForEntity()</span></span><br><span class="line"><span class="meta">@GetMapping(&quot;/consumer/payment/getForEntity/&#123;id&#125;&quot;)</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> CommonResult&lt;Payment&gt; <span class="title">getPayment2</span><span class="params">(<span class="meta">@PathVariable(&quot;id&quot;)</span> Long id)</span> </span>&#123;</span><br><span class="line">    ResponseEntity&lt;CommonResult&gt; entity = restTemplate.getForEntity(PAYMENT_URL + <span class="string">&quot;/payment/get/&quot;</span> + id, CommonResult.class);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (entity.getStatusCode().is2xxSuccessful())&#123;</span><br><span class="line">        <span class="keyword">return</span> entity.getBody();</span><br><span class="line">    &#125;<span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> CommonResult&lt;&gt;(<span class="number">444</span>,<span class="string">&quot;操作失败！&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>包含更详细的请求头，请求体之类的信息</p>
<h3 id="postForEntity"><a href="#postForEntity" class="headerlink" title="postForEntity"></a>postForEntity</h3><p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="C:%5CData%5CBlog%5Csource_posts%5CSpringCloud%E4%B9%8BRibbon%E8%B4%9F%E8%BD%BD%E5%9D%87%E8%A1%A1%E6%9C%8D%E5%8A%A1%E8%B0%83%E7%94%A8%5Cimage-20200707113745164.png" alt="image-20200707113745164"></p>
<h2 id="核心组件IRule"><a href="#核心组件IRule" class="headerlink" title="核心组件IRule"></a>核心组件IRule</h2><p>根据特定的算法中从服务列表中选取一个要访问的服务</p>
<p>SpringCloud结合Ribbon默认的自带有七种算法</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707151950.png" alt="image-20200707151949201"></p>
<ul>
<li>RoundRobinRule：轮询，依次执行每个执行一次(默认)</li>
<li>RandomRule：随机</li>
<li>RetryRule：先按照RoundRobinRule的策略获取服务，如果获取服务失败则在指定时间内会进行重试</li>
<li>WeightedResponseTimeRule：对RoundRobinRule的扩展，响应速度越快的实例选择权重越大，越容易被选择</li>
<li>BestAvailableRule ：会先过滤掉由于多次访问故障而处于断路器跳闸状态的服务，然后选择一个并发量最小的服务</li>
<li>AvailabilityFilteringRule：先过滤掉故障实例，再选择并发较小的实例</li>
<li>ZoneAvoidanceRule：默认规则，复合判断Server所在区域的性能和Server的可用性选择服务器</li>
</ul>
<h2 id="替换默认算法"><a href="#替换默认算法" class="headerlink" title="替换默认算法"></a>替换默认算法</h2><p>官方文档明确给出了警告：这个自定义配置类不能放在@ComponentScan所扫描的当前包下以及子包下，否则我们自定义的这个配置类就会被所有的Ribbon客户端所共享，达不到特殊化定制的目的了。</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707153049.png" alt="image-20200707153048231"></p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707153132.png" alt="image-20200707153130156"></p>
<p>而我们SpringBoot主启动类上的<code>@SpringBootApplication</code>源码中就使用了<code>@ComponentScan</code>扫描了主启动类所在的包和它的子包。</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707153259.png" alt="image-20200707153257856"></p>
<p>也就是我们不能在主启动类下的包创建配置类。而是于创建一个与它同级的包下编写配置类<code>MySelfRule</code>。</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707153548.png" alt="image-20200707153547168"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Configuration</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MySelfRule</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> IRule <span class="title">myRule</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> RandomRule();<span class="comment">//定义为随机</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>修改算法为<code>RandomRule</code>为随机算法</p>
<p>主启动类添加<code>@RibbonClient</code>name属性值代表访问此名称的微服务时，采用configuration配置的算法访问。</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707154040.png" alt="image-20200707154038617"></p>
<p>测试启动80</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707154449.png" alt="image-20200707154447621"></p>
<p>服务全都注册启动成功！</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707154431.png" alt="image-20200707154429054"></p>
<p>访问<code>http://localhost/consumer/payment/getForEntity/31</code>进行测试</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707154607.gif" alt="GIF1545"></p>
<p>可以看见调用服务提供者的算法不再时轮询，你一次我一次，而是变成了随机的调用。</p>
<h2 id="RoundRobinRule（轮询算法）"><a href="#RoundRobinRule（轮询算法）" class="headerlink" title="RoundRobinRule（轮询算法）"></a>RoundRobinRule（轮询算法）</h2><h3 id="原理"><a href="#原理" class="headerlink" title="原理"></a>原理</h3><p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707154812.png" alt="image-20200707154810588"></p>
<h3 id="手写"><a href="#手写" class="headerlink" title="手写"></a>手写</h3><p>8001 8002controller添加请求映射</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707155300.png" alt="image-20200707155258940"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@GetMapping(value = &quot;/payment/lb&quot;)</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> String <span class="title">getPaymentLB</span><span class="params">()</span></span>&#123;</span><br><span class="line">    <span class="keyword">return</span> serverPort;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>80主启动类注释配置算法@RibbonClient注解</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707155815.png" alt="image-20200707155813751"></p>
<p>80中的RestTemplate配置类ApplicationContextBean去掉@LoadBalanced</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707155413.png" alt="image-20200707155411435"></p>
<p>80创建lb包，创建LoadBalance接口</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707155550.png" alt="image-20200707155549470"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">LoadBalancer</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function">ServiceInstance <span class="title">instances</span><span class="params">(List&lt;ServiceInstance&gt; serviceInstances)</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>80创建实现类MyLB</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707155622.png" alt="image-20200707155621621"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MyLB</span> <span class="keyword">implements</span> <span class="title">LoadBalancer</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> AtomicInteger atomicInteger = <span class="keyword">new</span> AtomicInteger(<span class="number">0</span>);</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">final</span> <span class="keyword">int</span> <span class="title">getAndIncrement</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">int</span> current;</span><br><span class="line">        <span class="keyword">int</span> next;</span><br><span class="line">        <span class="keyword">do</span> &#123;</span><br><span class="line">            current = <span class="keyword">this</span>.atomicInteger.get();</span><br><span class="line">            next = current &gt;= <span class="number">2147483647</span> ? <span class="number">0</span> : current + <span class="number">1</span>;</span><br><span class="line">        &#125;<span class="keyword">while</span> (!<span class="keyword">this</span>.atomicInteger.compareAndSet(current,next));</span><br><span class="line">        System.out.println(<span class="string">&quot;****次数next:&quot;</span>+next);</span><br><span class="line">        <span class="keyword">return</span> next;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> ServiceInstance <span class="title">instances</span><span class="params">(List&lt;ServiceInstance&gt; serviceInstances)</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">int</span> index = getAndIncrement() % serviceInstances.size();</span><br><span class="line"></span><br><span class="line">        <span class="keyword">return</span> serviceInstances.get(index);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>编写控制类</p>
<p>注入我们编写的LoadBalancer，和DiscoverClient</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Resource</span></span><br><span class="line">LoadBalancer loadBalancer;</span><br><span class="line"></span><br><span class="line"><span class="meta">@Resource</span></span><br><span class="line">DiscoveryClient discoveryClient;</span><br></pre></td></tr></table></figure>

<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707160117.png" alt="image-20200707160115471"></p>
<p>编写请求方法</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707160236.png" alt="image-20200707160235163"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@GetMapping(&quot;/consumer/payment/lb&quot;)</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> String <span class="title">getPaymentLB</span><span class="params">()</span></span>&#123;</span><br><span class="line">    List&lt;ServiceInstance&gt; instances = discoveryClient.getInstances(<span class="string">&quot;CLOUD-PAYMENT-SERVICE&quot;</span>);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (instances==<span class="keyword">null</span>||instances.size()&lt;=<span class="number">0</span>)&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    ServiceInstance serviceInstance = loadBalancer.instances(instances);</span><br><span class="line">    URI uri = serviceInstance.getUri();</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> restTemplate.getForObject(uri+<span class="string">&quot;/payment/lb&quot;</span>,String.class);</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>启动项目进行测试</p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707160640.png" alt="image-20200707160638472"></p>
<p>访问<code>http://localhost/consumer/payment/lb</code></p>
<p><img src= "https://gitee.com/kylincw/images/raw/master/loading.gif" data-lazy-src="https://qiniu.codekylin.cn/img/20200707160740.gif" alt="GIF1607"></p>
<p>实现了轮询效果！</p>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">Kylin</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://www.codekylin.cn/4551.html">https://www.codekylin.cn/4551.html</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://www.codekylin.cn" target="_blank">Kylin</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/SpringCloud/">SpringCloud</a><a class="post-meta__tags" href="/tags/Ribbon/">Ribbon</a></div><div class="post_share"><div class="social-share" 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class="toc-text">集中式LB</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%BF%9B%E7%A8%8B%E5%86%85LB"><span class="toc-number">2.2.</span> <span class="toc-text">进程内LB</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%9E%B6%E6%9E%84%E8%AF%B4%E6%98%8E"><span class="toc-number">3.</span> <span class="toc-text">架构说明</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#RestTemplate%E4%BD%BF%E7%94%A8"><span class="toc-number">4.</span> <span class="toc-text">RestTemplate使用</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#getForEntity"><span class="toc-number">4.1.</span> <span class="toc-text">getForEntity</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#postForEntity"><span class="toc-number">4.2.</span> <span class="toc-text">postForEntity</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%A0%B8%E5%BF%83%E7%BB%84%E4%BB%B6IRule"><span class="toc-number">5.</span> <span class="toc-text">核心组件IRule</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E6%9B%BF%E6%8D%A2%E9%BB%98%E8%AE%A4%E7%AE%97%E6%B3%95"><span class="toc-number">6.</span> <span class="toc-text">替换默认算法</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#RoundRobinRule%EF%BC%88%E8%BD%AE%E8%AF%A2%E7%AE%97%E6%B3%95%EF%BC%89"><span class="toc-number">7.</span> <span class="toc-text">RoundRobinRule（轮询算法）</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%8E%9F%E7%90%86"><span class="toc-number">7.1.</span> <span class="toc-text">原理</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%89%8B%E5%86%99"><span class="toc-number">7.2.</span> <span class="toc-text">手写</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas 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